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Korean ALICE Activities and High Momentum Particle IDentification in ALICE

Korean ALICE Activities and High Momentum Particle IDentification in ALICE. In-Kwon Yoo Pusan National University for KoALICE. Outline. A Large Ion Collider Experiment at LHC Particle Identification in ALICE Why HMPID? High p T Suppression / Jet Quenching pp @ LHC vs. RHIC

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Korean ALICE Activities and High Momentum Particle IDentification in ALICE

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  1. Korean ALICE Activities and High Momentum Particle IDentification in ALICE • In-Kwon Yoo • Pusan National University • for KoALICE

  2. Outline • A Large Ion Collider Experiment at LHC • Particle Identification in ALICE • Why HMPID? • High pT Suppression / Jet Quenching • pp @ LHC vs. RHIC • Discrepancy at High pT • HMPID RICH Detector • KoALICE Collaboration

  3. ATLAS CMS ALICE The ALICE • Dedicated for Heavy Ion Collision Exp. / 1000 from 100 inst. in 30 cntries.

  4. LHC Workshop 2009 PID in ALICE Solenoid magnet 0.5 T ALICE: the dedicated HI experiment Why HMPID? • Forward detectors: • PMD • FMD, T0, V0, ZDC Full azimuthal coverage : ITS, TPC, ToF ITS, TPC upto p ~ 600 MeV/c ToF upto ~ 1.2 – 1.4 GeV/c Single-arm detector : HMPID for 1 – 5 GeV/c • Specialized detectors: • HMPID • PHOS • Central tracking system: • ITS • TPC • TRD • TOF • MUON Spectrometer: • absorbers • tracking stations • trigger chambers • dipole

  5. ALICE 2010 • ITS, TPC, TOF, HMPID, MUON, V0, T0, FMD, PMD, ZDC completed • TRD 7/18 • EMCAL 4/10 • PHOS 3/5

  6. Particle Identification TPC dE/dx 7 TeV pps ≈5-6% Vertex detector pT(min)<100MeV TOF 150k channels! s ≈ 90 ps

  7. PID in ALICE

  8. Why HMPID? • High pT Suppression in AA Final Data Preliminary Data

  9. pT(assoc) > 2 GeV/c Hard associated particles → suppression 4 < pT(trig) < 6 GeV/c pT(assoc) > 0.15 GeV/c Soft associated particles→ enhancement Jet Quenching

  10. pp@LHC vs. RHIC CMS result: unexpected ‘ridge’ in high Mult. pp somewhat similar phenomenon seen at RHIC in HI collisions

  11. Nuclear Modification Factor P. Fachini (STAR) • Same RAA for ,, • Different RAA for pbar,p,Ks, e(NPE) • J/psi suppressed or not? Zhangbu Xu, QM08, Jaipur, India

  12. K/p Ratio at 900 GeV • Prel. Results: • very large K/p ratio at high pT • not reproduced by event generators

  13. HMPI Detector • RADIATOR • 15 mm liquid C6F14, n ~ 1.2989 @ 175nm, (bg)h = 1.21 • PHOTON CONVERTER • Reflective layer of CsI QE ~ 25% @ 175 nm. • PHOTOELECTRON DETECTOR • MWPC with CH4 at atmospheric pressure (4 mm gap) HV = 2050 V.

  14. VHMPI Detector Project • An Upgrade Project of HMPID • Up to 30 GeV/c • Track-by-Track PID • Just Changing the Cherenkov Radiator : ‘Gas Radiator’: C4F10 (<n>≈1.0014, γth≈18.9) • Limited Radiator length : 80cm : Concave Mirror with VUV(~150nm) reflectivity • Large photosensitive area : ~3m2 • Acceptance : 12% area of TPC, pseudo rapidity |η | < 0.5 (jet fully contained)

  15. VHMPID R&D • Much less photons → Gas Property, Mirror, CsI-PD • Online transparency measurement/cleaning system • Manufactured in PNU → Assemble in progress at CERN • Test Experiments at PS (Oct.2010) & SPS (Nov.2010) 15

  16. Korea-ALICE Members • Total : 33 Participants (11 PhDs, 9 PhD St., 9 MA St., 1 MA, 3 UG St.) • Gangnung-Wonju National University* : 5 PhDs, 5 PhD St., 3 MA St. • Pusan National University : 2 PhDs, 1 PhD St., 2 MA St., 3 UG St. • Sejong University : 2 PhDs, 1 PhD St., 1 MA • Yonsei University : 2 PhDs, 2 PhD St., 4 MA St. • Residents at CERN : 3 PhDs (2 Profs. just returned), 5 PhD St., 1 MA St. • Residents at Korea : 8 Profs, 5 PhD St., 8 MA St., 3 UG St. • 1 PhD + 2 PhD St. (MA) + 3 UG St. increased since 2009-02

  17. Korea-ALICE Activities I • Gangnung-Wonju National University • ALICE-ToF R&D, installation and operation • Multi-Gap RPC : Time Resolution enhanced • ALICE-EM Calorimeter (Muon Detector) operation • Y Production Study • Particle Reconstruction Algorithm Developments • Charm Production (ΛC) in pp@14 TeV

  18. Korea-ALICE Activities II • Sejong University • ALICE Computing GRID Operation • Theoretical Calculation on Hadron Phenomena at LHC (pp and PbPb collisions) • Finite Temperature/Density Lattice Field Theory

  19. Korea-ALICE Activities III • Pusan National University • ALICE-HMPID R&D and Operation • VHMPID Prototype & Test Ongoing (Optical Transparency Meter) • Gas System Control System R&D using ALICE-DCS • PWG2 : Data Analysis in pp High Multiplicity Events

  20. Korea-ALICE Activities IV • Yonsei University • ALICE-TRD Installation and Operation • linking PHENIX-FoCAL to ALICE in future • Direct Photon Measurement in AA Study (π0➔ γγ study)

  21. Korea-ALICE Budget 2010 • 2010 Total : 580 M KRW • KICOS -> CERN : 450 M • resident • visiting • R&D ~ 10M (VHMPID) • local at PNU : 130 M • salary / local travel • admin. / overhead • 2011 M&O-A • GWNU : 5 • PNU : 1 • Sejong : 2 • Yonsei : 2

  22. Korea-ALICE Meetings / Workshops • Steering Committee Meeting : 4 Rep. from 4 Institutions (KoALICE Web.) • STC 2010-01/02/03 • KoALICE bylaw modified • A New Spokesperson election / Reports • STC 2010-04 • 2010 Budget Plan • STC 2010-10 • M&O-A Self-Evaluation : Decision of M&O-A 2011 • KoALICERegular Meeting : CERN coordinator + all researchers + EVO • Report who is doing what when where how and why • Archive KoALICE-Indico Web. • Workshops • HIM (Asian-ALICE) • LHC-APCTP • KPS-Pioneering Symposium

  23. … will be continued … • pp RUN ends in Oct. / AA RUN starts in Nov. for 4 wks. • Towards the 1st Results from KoALICE • Getting started : Data Analysis • Local User Policy discussion with KISTI • Main Upgrade during 2012/13 • Thank you for your supports

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